UN says global effort to repair the Ozone layer is actually working
by Paul Davies
What's Going On Here?
What Does This Mean?
Ozone (O3) provides our planet with a protective layer (about 30 miles up, above the stratosphere) shielding us from cancer-causing UV radiation. Levels of ozone change naturally due to seasons and sunlight, but man-made aerosol damage tipped the balance.
In 1987, the Montreal Protocol was signed by nations of the world. It involved the banning of chemicals known as chlorofluorocarbons (CFCs) in response to the discovery of a hole in the ozone layer over Antartica two years prior, caused by CFCs.
Why Should We Care?
Next year, there are going to be changes to the Montreal Protocol, called the Kigali amendment. This is intended to reduce future climate change by targeting HFC gases (used in refrigeration) that have a warming effect of over 10,000 times greater than CO2.
Areas of low ozone above Antarctica on September 2000, left, and September 2018. Photograph: Nasa
Check out this incredible video by NASA, showing how the Ozone layer has recovered since 1980.
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